Chapter 2.9, Problem 43SC

Explanation of Solution

Modification of the program to draw one rectangle and one square:

Refer the example “section_9_2/ RectangleComponent.java” which describes about how to display the component. In that program, change the line number “21” of Rectangle Component which is highlighted as follows,

Code:

//Import the required java packages

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import javax.swing.JComponent;

//Define the method to draw the component

public class RectangleComponent extends JComponent

{

    //Define the method paintComponent()

    public void paintComponent(Graphics g)

     {

         // Recover Graphics2D

         Graphics2D g2 = (Graphics2D) g;

         // Construct a rectangle 

         Rectangle box = new Rectangle(5, 10, 20, 30);

   //Draw the rectangle

         g2.draw(box);

         /* Move rectangle 15 units to the right and 25

 units down*/

         box = new Rectangle(5, 10, 20, 20);

         // Draw moved rectangle

         g2.draw(box);

     }

 }

File name: “Square.java”

//Import the required package

import javax.swing.JFrame;

//Declare the class "Square"

public class Square

{

    //Define the main function

    public static void main(String[] args)

    {

        //Create the object for JFrame class

        JFrame frame = new JFrame();

        //Set the size of the frame

        frame.setSize(300, 400);

        //Set the title of the frame

        frame.setTitle("Two squares");

        //Set the default operation to close the frame

    frame...